摘要
为弄清采矿动压对附近巷道围岩稳定性的影响,并为对巷道变形破坏显著地段和冲击地压的危险性预测提供依据,以某矿工作面开采为研究对象,建立三维数值模型,分析了采矿围岩应力演化规律;探讨了采矿动压对巷道围岩应力及应变的影响.研究表明:采场应力数值逐渐增大,应力集中区域自临空面向周边扩展、向前推进、且连续变化;掘进进度相同时,右帮围岩应力数值和增加梯度大于左帮围岩;同一选取路径上,右帮围岩应力呈阶梯状变化,而左帮的围岩应力呈规则状的曲线变化;采动动压引起巷道围岩应力集中,围岩中积聚的弹性变形能增加,具备发生冲击地压的内在条件.
In order to understand fully the effect of dynamic mining pressure on the entry stability,and provide the basis for locating the entry section where formation and break are considerable and forecasting the degree to which impact ground pressure takes place,the evolution law on entry surrounding stress due to actual mining is analyzed aiming at a special mining face by a 3D numerical model.Besides,the effect of dynamic mining pressure on the stress and strain is discussed.The analysis and discussion show the following facts.The stope stress increases gradually in magnitude,and the stress concentration area extends from the free face,and moves ahead,and changes continuously.The surrounding rock stress in the right wall is greater in magnitude and in changing gradient than that in the left wall when the entry is driven at the same rate.The stress curve changes in stages in right wall;but regularly in the left wall on same picked path.The dynamic mining pressure results in stress concentration in entry surrounding rock;and the stress concentration makes the elastic deformation energy stored in the surrounding rock increase,which lead probably to the internal condition under which the impact ground pressure appears in the surrounding rock.
出处
《三峡大学学报（自然科学版）》
CAS
2011年第1期51-54,共4页
Journal of China Three Gorges University：Natural Sciences
基金
国家自然科学基金资助项目(50978251)
江苏省普通高校研究生科研创新计划资助项目(CX10B_138Z)
关键词
采矿动压
应力集中
冲击地压
巷道稳定
dynamic mining pressure
stress concentration
impact ground pressure
entry stability
